object/id: Split files

1 files changed, 20 insertions, 0 deletions

diff --git a/object/id/objectid_frombytes.go b/object/id/objectid_frombytes.go
new file mode 100644
index 00000000..ea8dacfe
--- /dev/null
+++ b/object/id/objectid_frombytes.go
@@ -0,0 +1,20 @@
+package objectid
+
+import "fmt"
+
+// FromBytes builds an object ID from raw bytes for the specified algorithm.
+func FromBytes(algo Algorithm, b []byte) (ObjectID, error) {
+	var id ObjectID
+	if algo.Size() == 0 {
+		return id, ErrInvalidAlgorithm
+	}
+
+	if len(b) != algo.Size() {
+		return id, fmt.Errorf("%w: got %d bytes, expected %d", ErrInvalidObjectID, len(b), algo.Size())
+	}
+
+	copy(id.data[:], b)
+	id.algo = algo
+
+	return id, nil
+}